这个知识点在哪一节，是重点记忆点吗？

问题如下：

Determine and justify the potentially influential observation(s) in Exhibit 1 using the leverage measure.

选项：

A.Observation 50, because it has the highest leverage, at 0.141

B.Observations 6 and 50, because their leverage exceeds 0.100

C.

Observations 6, 50, and 94, because their leverage exceeds

解释：

C is correct. The rule of thumb for the leverage measure is that if it exceeds , where k is the number of independent variables, then it is a potentiallyinfluential observation. Since n = 96 and k = 2, then 3 (2 +1 )/96 = 0.09375. Threeobservations exceed this value: 6, 50, and 94. So, they are potentially influentialobservations.